package com.sky.service.impl;


import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.annotation.AutoFill;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.enumeration.OperationType;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.ArrayList;
import java.util.List;

/**
 * 菜品业务层
 */
@Service
@Slf4j
public class DishServiceImpl implements DishService {

    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private DishFlavorMapper dishFlavorMapper;
    @Autowired
    private SetmealDishMapper setmealDishMapper;

    /**
     * 新增菜品
     * @param dishDTO
     */
    @Transactional
    @Override
    public void saveWithFlavor(DishDTO dishDTO) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);
        // 向dish表插入一条新数据
        dishMapper.insert(dish);

        // 对于新的口味进行插入
        List<DishFlavor> flavors = dishDTO.getFlavors();

        if(flavors != null && !flavors.isEmpty()) {
            // 向dish_flavor表中插入n条口味，一定要使用dish而不是dishDTO，其中没有id数据
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dish.getId());
            });
            // 批量插入
            dishFlavorMapper.insertBatch(flavors);
        }
    }


    /**
     * 菜品分页查询
     * @param dishPageQueryDTO
     * @return
     */
    @Override
    public PageResult pageQuery(DishPageQueryDTO dishPageQueryDTO) {
        PageHelper.startPage(dishPageQueryDTO.getPage(), dishPageQueryDTO.getPageSize());
        Page<DishVO> page = dishMapper.pageQuery(dishPageQueryDTO);
        return new PageResult(page.getTotal(), page.getResult());
    }

    /**
     * 批量删除菜品
     * @param ids
     */
    @Override
    @Transactional
    public void deleteBatch(List<Long> ids) {
        ids.forEach(id -> {
            Dish dish = dishMapper.getById(id);
            // 判断当前菜品是否处于起售中
            if(dish.getStatus() == StatusConstant.ENABLE) {
                // 如果处于起售中的状态，则需要抛出业务异常
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
            }
        });

        // 判断当前要删除的菜品是否被关联了
        List<Long> setmealIds = setmealDishMapper.getSetmealIdsByDishIds(ids);
        if(setmealIds != null && setmealIds.size() > 0) {
            // 有关联的数据
            throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
        }

        // 没有起售，并且没有被关联
        ids.forEach(id -> {
            dishMapper.deleteById(id);
            // 删除口味表中的数据
            dishFlavorMapper.deleteByDishId(id);
        });

    }

    /**
     * 根据id查询菜品
     * @param id
     * @return
     */
    @Override
    public DishVO getByIdWithFlavor(Long id) {
        // 查询菜品表
        Dish dish = dishMapper.getById(id);

        // 查询关联的口味
        List<DishFlavor> dishFlavorList = dishFlavorMapper.getByDishId(id);

        // 封装成DishVO对象
        DishVO dishVO = new DishVO();
        BeanUtils.copyProperties(dish, dishVO);
        dishVO.setFlavors(dishFlavorList);
        return dishVO;
    }

    /**
     * 根据id修改菜品和关联的口味
     * @param dishDTO
     */
    @Override
    @Transactional
    public void updateWithFlavor(DishDTO dishDTO) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);

        // 修改dish菜品表，执行update操作
        dishMapper.update(dish);

        // 删除当前菜品关联的口味，操作dish_flavor表， 执行delete操作
        dishFlavorMapper.deleteByDishId(dishDTO.getId());

        // 插入最新的口味数据，操作dish_flavor表，执行insert操作
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if(flavors != null && !flavors.isEmpty() ) {
            flavors.forEach( dishFlavor -> {
                // 这里使用dish更加保险一点，因为dishDTO中可能没有id数据
                dishFlavor.setDishId(dish.getId());
            });
            dishFlavorMapper.insertBatch(flavors);
        }
    }

    /**
     * 菜品起售、停售
     * @param status
     * @param id
     */
    @Transactional
    @Override
    public void startOrStop(Integer status, Long id) {
        Dish dish = Dish.builder().id(id).status(status).build();
        dishMapper.update(dish);
    }

    /**
     * 根据分类id查询菜品
     * @param categoryId
     * @return
     */
    @Override
    public List<Dish> getByCategoryId(Long categoryId) {
        // 筛选出满足条件的菜品分类
        Dish dish = Dish.builder().categoryId(categoryId).status(StatusConstant.ENABLE).build();
        return dishMapper.getByCategoryId(dish);
    }

    /**
     * 条件查询菜品和口味
     * @param dish
     * @return
     */
    public List<DishVO> listWithFlavor(Dish dish) {
        //List<Dish> dishList = dishMapper.list(dish);

        // 根据自己的内容修改
        List<Dish> dishList = dishMapper.getByCategoryId(dish);

        List<DishVO> dishVOList = new ArrayList<>();

        for (Dish d : dishList) {
            DishVO dishVO = new DishVO();
            BeanUtils.copyProperties(d,dishVO);

            //根据菜品id查询对应的口味
            List<DishFlavor> flavors = dishFlavorMapper.getByDishId(d.getId());

            dishVO.setFlavors(flavors);
            dishVOList.add(dishVO);
        }

        return dishVOList;
    }
}
